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/*
* Copyright (C) 2020 The Android Open Sourete Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "coverage"
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <assert.h>
#include <sys/mman.h>
#include <sys/uio.h>
#include <trusty/coverage/coverage.h>
#include <trusty/coverage/tipc.h>
#include <trusty/tipc.h>
#define COVERAGE_CLIENT_PORT "com.android.trusty.coverage.client"
namespace android {
namespace trusty {
namespace coverage {
using android::base::ErrnoError;
using android::base::Error;
using std::string;
static inline uintptr_t RoundPageUp(uintptr_t val) {
return (val + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
}
CoverageRecord::CoverageRecord(string tipc_dev, struct uuid* uuid)
: tipc_dev_(std::move(tipc_dev)),
coverage_srv_fd_(-1),
uuid_(*uuid),
record_len_(0),
shm_(NULL),
shm_len_(0) {}
CoverageRecord::~CoverageRecord() {
if (shm_) {
munmap((void*)shm_, shm_len_);
}
}
Result<void> CoverageRecord::Rpc(coverage_client_req* req, int req_fd, coverage_client_resp* resp) {
int rc;
if (req_fd < 0) {
rc = write(coverage_srv_fd_, req, sizeof(*req));
} else {
iovec iov = {
.iov_base = req,
.iov_len = sizeof(*req),
};
trusty_shm shm = {
.fd = req_fd,
.transfer = TRUSTY_SHARE,
};
rc = tipc_send(coverage_srv_fd_, &iov, 1, &shm, 1);
}
if (rc != (int)sizeof(*req)) {
return ErrnoError() << "failed to send request to coverage server: ";
}
rc = read(coverage_srv_fd_, resp, sizeof(*resp));
if (rc != (int)sizeof(*resp)) {
return ErrnoError() << "failed to read reply from coverage server: ";
}
if (resp->hdr.cmd != (req->hdr.cmd | COVERAGE_CLIENT_CMD_RESP_BIT)) {
return ErrnoError() << "unknown response cmd: " << resp->hdr.cmd;
}
return {};
}
Result<void> CoverageRecord::Open() {
coverage_client_req req;
coverage_client_resp resp;
if (shm_) {
return {}; /* already initialized */
}
int fd = tipc_connect(tipc_dev_.c_str(), COVERAGE_CLIENT_PORT);
if (fd < 0) {
return ErrnoError() << "failed to connect to Trusty coverarge server: ";
}
coverage_srv_fd_.reset(fd);
req.hdr.cmd = COVERAGE_CLIENT_CMD_OPEN;
req.open_args.uuid = uuid_;
auto ret = Rpc(&req, -1, &resp);
if (!ret.ok()) {
return Error() << "failed to open coverage client: ";
}
record_len_ = resp.open_args.record_len;
shm_len_ = RoundPageUp(record_len_);
fd = memfd_create("trusty-coverage", 0);
if (fd < 0) {
return ErrnoError() << "failed to create memfd: ";
}
unique_fd memfd(fd);
if (ftruncate(memfd, shm_len_) < 0) {
return ErrnoError() << "failed to resize memfd: ";
}
void* shm = mmap(0, shm_len_, PROT_READ | PROT_WRITE, MAP_SHARED, memfd, 0);
if (shm == MAP_FAILED) {
return ErrnoError() << "failed to map memfd: ";
}
req.hdr.cmd = COVERAGE_CLIENT_CMD_SHARE_RECORD;
req.share_record_args.shm_len = shm_len_;
ret = Rpc(&req, memfd, &resp);
if (!ret.ok()) {
return Error() << "failed to send shared memory: ";
}
shm_ = shm;
return {};
}
void CoverageRecord::Reset() {
for (size_t i = 0; i < shm_len_; i++) {
*((volatile uint8_t*)shm_ + i) = 0;
}
}
void CoverageRecord::GetRawData(volatile void** begin, volatile void** end) {
assert(shm_);
*begin = shm_;
*end = (uint8_t*)(*begin) + record_len_;
}
uint64_t CoverageRecord::CountEdges() {
assert(shm_);
uint64_t counter = 0;
volatile uint8_t* begin = NULL;
volatile uint8_t* end = NULL;
GetRawData((volatile void**)&begin, (volatile void**)&end);
for (volatile uint8_t* x = begin; x < end; x++) {
counter += *x;
}
return counter;
}
} // namespace coverage
} // namespace trusty
} // namespace android
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